October 2012
2-5
ColorQube 8570/8870 Service Manual
Power On Self Tests
Fault Messages and Codes
Xerox Internal Use Only - Revised, 3rd Revision
Detected POST Faults
Table 1 lists possible detected errors and their associated fault codes.
NOTE: POST error 226 can indicate blown Fuse F501 in the Electronics Module, or Control
Panel is unplugged or its cable is damaged.
Sequence
The following sequence describes the operational steps just prior to, during, and just after the
loading of POST stand-alone code. Whenever any of the following sequence steps fail, POST
will halt at the failed test, writes the failed test fault code to the Control Panel LCD and flashes
the Control Panel LED with the associated blink code.
1. When power is turned on, the Control Panel LED is turned off and dim. The Control Panel
LCD is blank.
2. The Boot loader is run.
3. The Boot loader loads the flash image of FPGA.
4. The Boot loader loads and runs the POST stand-alone code.
5. POST turns on the Electronics Module Fan full. The Fan remains on until the Engine
region is loaded and PEST takes over control of the Fan.
6. POST checks the load status of FPGA.
7. POST turns LEDs off.
8. POST checks if the Control Panel link is valid.
a. If valid attempt to initialize the Control Panel. Verify LCD data connection is OK. Dis-
play Control Panel header. POST checks for POST Cancel button from the Control
Panel. If cancel received, exits POST and return control back to the Boot loader.
b. If invalid skips initializing the Control Panel.
9. POST attempts to read config space by reading FPGA’s vendor ID.
10. POST attempts to read and write a defined FPGA register.
11. POST attempts to interrupt FPGA.
12. POST attempts EEPROM tests.
13. POST attempts Real Time Clock tests.
14. POST checks RAM size.
15. POST sets the Control Panel LED on green.
16. POST stand-alone code exits and returns control back to the Boot loader.
17. The OS is loaded.
Print Engine Self-Test
Print Engine Self-Test (PEST) tests components if they are drawing power. PEST tests occur
after POST tests have been run and PostScript has been initialized. PEST checks the connec
-
tions and operation of various components. PEST runs as part of the print engine.
PEST Error Reporting
Fault codes for PEST are displayed on the Control Panel and are in the 99,XXX series. For
troubleshooting PEST fault codes, see Fault Messages and Codes Troubleshooting.
Table 1 POST Error Type
Description Fault Code
POST_BAD_ERROR_CODE 211
POST_RTC_READ_FAILURE 212
POST_RTC_WRITE_FAILURE 213
POST_RTC_REREAD_FAILURE 214
POST_RTC_NOT_TICKING 215
POST_RTC_TRICKLE_CHRG_FAILURE 216
POST_EEPROM_READ_FAILURE 217
POST_EEPROM_WRITE_FAILURE 218
POST_EEPROM_REREAD_FAILURE 219
POST_EEPROM_DATA_FAILURE 221
POST_RAM_INSUFFICIENT 222
POST_FP_LINK_INVALID 223
POST_FP_WONT_INIT 225
POST_FP_DATA_PATH_FAILURE 226
POST_PROG_MACHINE_CHECK 227
POST_FPGA_LOAD_FAILURE 228
POST_FPGA_ID_READ_FAILURE 229
POST_FPGA_ID_MISMATCH 231
POST_FPGA_WRITE_MISMATCH 232
POST_FPGA_INTERRUPT_FAIL 233
POST_FPGA_ACCESS_FAIL 234
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